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LOANS (Details 5) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Loans          
Nonaccrual $ 2,050,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus   $ 6,577,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus $ 2,974,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus  
Loans Past Due Over 90 Days Still Accruing 436,000us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing   24,000us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing 554,000us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing  
Accruing Troubled Debt Restructurings 6,122,000us-gaap_FinancingReceivableModificationsRecordedInvestment   6,138,000us-gaap_FinancingReceivableModificationsRecordedInvestment 6,901,000us-gaap_FinancingReceivableModificationsRecordedInvestment  
Percentage of nonaccrual loans secured by real estate 99.80%ktyb_FinancingReceivablePercentageOfNonaccrualInvestmentSecuredByRealEstate   99.60%ktyb_FinancingReceivablePercentageOfNonaccrualInvestmentSecuredByRealEstate    
Minimum period for which principal or interest is in default for loans to be considered as nonaccrual 90 days        
Maximum period past due for loans to be considered as impaired 90 days        
Impaired loans transferred to other real estate owned 3,029,000us-gaap_RealEstateAcquisitionsThroughForeclosures 141,000us-gaap_RealEstateAcquisitionsThroughForeclosures 3,275,321us-gaap_RealEstateAcquisitionsThroughForeclosures 471,500us-gaap_RealEstateAcquisitionsThroughForeclosures 2,266,875us-gaap_RealEstateAcquisitionsThroughForeclosures
Commercial          
Loans          
Nonaccrual     25,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_CommercialLoanMember
   
Real estate construction          
Loans          
Nonaccrual 140,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ktyb_RealEstateConstructionLoansMember
  142,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ktyb_RealEstateConstructionLoansMember
   
1-4 family residential          
Loans          
Nonaccrual 1,301,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ktyb_OneToFourFamilyResidentialMortgageLoansMember
  1,390,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ktyb_OneToFourFamilyResidentialMortgageLoansMember
1,171,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ktyb_OneToFourFamilyResidentialMortgageLoansMember
 
Loans Past Due Over 90 Days Still Accruing 158,000us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ktyb_OneToFourFamilyResidentialMortgageLoansMember
  23,000us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ktyb_OneToFourFamilyResidentialMortgageLoansMember
314,000us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ktyb_OneToFourFamilyResidentialMortgageLoansMember
 
Accruing Troubled Debt Restructurings 477,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ktyb_OneToFourFamilyResidentialMortgageLoansMember
  480,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ktyb_OneToFourFamilyResidentialMortgageLoansMember
493,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ktyb_OneToFourFamilyResidentialMortgageLoansMember
 
Multi-family residential          
Loans          
Nonaccrual 225,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ktyb_MultiFamilyResidentialMortgageLoansMember
  264,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ktyb_MultiFamilyResidentialMortgageLoansMember
275,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ktyb_MultiFamilyResidentialMortgageLoansMember
 
Non-farm & non-residential          
Loans          
Nonaccrual 380,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ktyb_NonFarmAndNonResidentialMortgageLoansMember
  380,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ktyb_NonFarmAndNonResidentialMortgageLoansMember
803,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ktyb_NonFarmAndNonResidentialMortgageLoansMember
 
Accruing Troubled Debt Restructurings 1,816,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ktyb_NonFarmAndNonResidentialMortgageLoansMember
  1,829,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ktyb_NonFarmAndNonResidentialMortgageLoansMember
1,878,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ktyb_NonFarmAndNonResidentialMortgageLoansMember
 
Agricultural          
Loans          
Nonaccrual     4,371,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ktyb_AgriculturalLoansMember
717,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ktyb_AgriculturalLoansMember
 
Loans Past Due Over 90 Days Still Accruing 232,000us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ktyb_AgriculturalLoansMember
    232,000us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ktyb_AgriculturalLoansMember
 
Accruing Troubled Debt Restructurings 3,829,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ktyb_AgriculturalLoansMember
  3,829,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ktyb_AgriculturalLoansMember
4,530,000us-gaap_FinancingReceivableModificationsRecordedInvestment
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= ktyb_AgriculturalLoansMember
 
Consumer          
Loans          
Nonaccrual 4,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
  5,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
8,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
 
Loans Past Due Over 90 Days Still Accruing $ 46,000us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
  $ 1,000us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember
$ 8,000us-gaap_FinancingReceivableRecordedInvestment90DaysPastDueAndStillAccruing
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= us-gaap_ConsumerLoanMember